\documentclass[a4paper]{article}
\usepackage{german}
\usepackage[utf8]{inputenc}

\usepackage{pgfplots}

\usepackage{pgfplotstable}
\usepackage{booktabs}
\usepackage{array}
\usepackage{colortbl}

\begin{document}

\begin{tikzpicture}
	% shows X-Z plane
	\begin{axis}[
		axis equal,
		xlabel=x,
		ylabel=y,
		zlabel=z,
		view={0}{0}]
	\addplot3[draw=red,fill=yellow!50!red] table {
		X Y Z
		0 0 0
		1 -3 1
		0 3 2
	} --cycle;
	\end{axis}
\end{tikzpicture}
\end{document}

